Add interface for per element operations

[cwsmith]

This includes:

• definition of linear and quadratic shape functions for simplicies (edges, triangles, and tets)
• support for user/application element-to-dof ordering and the subsequent index into the arrays holding field data - i.e., the user/application has a different definition of the ordering/numbering of dof holders in a triangle/tet than what MeshFields uses. Note, this PR does not yet include programmatic access to the built-in/native MeshFields canonical ordering for each type of element+shape function combination.
• tests using dummy mesh and Omega_h data to exercise the APIs

Discussion:

• is a test of the shape function values, as done in shapefun.cc from pumi, a good addition?
  • yes

Todo:

• add test for tetrahedrons e118072
• add test that creates a field over an omegah mesh and evaluates the field d49551c
• add tests that check the results of the evaluate operation using
  • linear shape function @ centroid d49551c
  • linear shape function @ interior 82f3a4f
  • quadratic shape function @ centroid 34b26b3
  • quadratic shape function @ interior 34b26b3
  • quadratic shape function with linear analytic function @ interior 34b26b3
• add helper method that writes the field to Omega_h tags for rendering/etc.
  • bug in serialize see serialize: index computation error for rank 3 views #39
• extend evaluate to accept a multiple points per element 2535f17
• documentation - class/struct interaction
• documents - nomenclature
• add mesh+fields interface and implement with omegah a87c33c

[ ] add static asserts for templated interfaces and classes See #43
[ ] test with cabana controller See #44

[github-actions]

Package	Line Rate	Complexity	Health
...build-kokkos.install.include	65%	0	➖
...build-kokkos.install.include.Serial	97%	0	✔
...build-kokkos.install.include.View.Hooks	100%	0	✔
...build-kokkos.install.include.View	88%	0	✔
...build-kokkos.install.include.desul.atomics	100%	0	✔
...build-kokkos.install.include.impl	75%	0	✔
...build-omegah.install.include	25%	0	❌
meshFields.src	94%	0	✔
meshFields.test	96%	0	✔
Summary	86% (2051 / 2393)	0	✔